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| Z8E520 Datasheet, PDF (16/43 Pages) Zilog, Inc. – 1.5 MBPS USB Device Controller | |||
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Z8E520/C520
1.5 MBPS USB Device Controller
Zilog
PORT B (0â5) QUADRATURE CONFIGURATION (Continued)
Table 5. Programmable Voltage Bit Selections (Register Addresses DAâDF)
Comp EnableâBit D7
VREFâ Bits D5:4
Selected
0
xx
Comparator Off
1
01
0.25 VCC
1
10
0.35 VCC
1
11
0.45 VCC
Note:
1. If all comparators are off, VREF can be powered off. If in Stop Mode, VREF is powered off.
Conditions
Note (1)
Symbol
Parameter
VMID
RL1
RL2
RL3
RL4
RL5
RL6
Ratio
Midpoint Voltage
Load Resistor 1
Load Resistor 2
Load Resistor 3
Load Resistor 4
Load Resistor 5
Load Resistor 6
Ratio Accuracy
Note:
1. Greatest ratio vs. specified ratio.
Table 6. Programmable Load Resistor
Min.
0.13 VCC
5.25
9.00
13.50
32.25
55.50
83.25
Max.
0.15 VCC
8.75
15.00
22.50
53.75
92.50
138.75
5
Units
V
K ohm
K ohm
K ohm
K ohm
K ohm
K ohm
%
Conditions
Pad to VSS, track RL2, RL3
Pad to VSS, track RL1, RL3
Pad to VSS, track RL1, RL2
Pad to VCC
Pad to VCC
Pad to VCC
Note (1)
Table 7. Programmable Load Resistor Bit Selections (Register Addresses DAâDF
Divider Bits D2:0
000
001
010
100
Load Selected to VSS
No load Resistors
7 K Selected
12 K Selected
18 K Selected
Load Selected to VCC
No load Resistors
43 K Selected
74 K Selected
111 K Selected
Symbol
Parameter
VOS
HYS
VCM
Offset Voltage
Hysteresis
Voltage Range
Trf
Response Time Fast
Trs
Response Time Slow
IDD
Supply Current
Note:
1. Zilog will provide specification.
Table 8. Comparator
Min.
TBD
VSSâ0.3
Max.
25
TBD
VCCâ1.0
1
1
100
Units
mV
mV
V
µs
µs
µA
Conditions
Common Mode, Note (1)
700 mV/µs with 25 mV overdrive
15 mV/µs with 25 mV overdrive
16
PRELIMINARY
DS97KEY2005
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